Warm-air furnace



Febfls, 1923. 1, 2%,122 F. H. WOOD WARM A IR FURNACE Filed Dec. 51, 1921 q Witmeooc o Patented Feb. 13, i923.

UNirEu stares 1,445,122 Parent carter...

FREDERICK E. WOOID, OF CHICAGO, ILLINOIS, 'ASSIG-NGB T LETTIE B. WOOD, OF CHICAGO, ILLINOIS. i

Y WARM-AIR FURNACE.

Application filed December 31, 1921. Serial No. 526,410.

T 0 all whom it may, concern Be it known that I, F nnnnnror: H. vVooD,

, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in the Construction of Warm-Air Furnaces for Heating Houses and Other Buildings, of which the following is a specification. i i

This invention relatesv to improvements in a furnace whereby fresh exterior air may be used in conjunction withthe recirculating air from the rooms, in such a manner that these two currents of widely differing temperature may pass the heating surfaces of the furnace without exerting an adverse influence on eachother that wouldtend to retard their free passage to the rooms of the house.

It has been customary to mingle these two currents, of exterior fresh air and the recirculating air from the rooms, at some point prior to their passing the heated surfaces of the furnace. Finding that this method tends to retard the desired oirculation of the air, I have devised a means of passing these two currents past the heating surfaces of the furnace in such a manner that they are entirely separated from each other and not mingled, until each has been heated to a degree that will cause them to expand and rise in circulation.

I attain this object by the furnace illus trated in the accompanying drawing, the nature whereof will be fully understood from the description I give below, when considered in connection with the drawing in which Figure 1 represents a plan of a furnace. Figure 2 shows the vertical furnace, and Figure 3 shows the partitions G and H extended to the horizontal top of the casing A. Fig. 4: shows the location of the fresh air compartment with reference to a modified type of furnace. Similar letters refer to similar parts throughout in the several views.

The air from the rooms is returned to the furnace through the return duct D, entering within the casing A of the furnace through the extension E of the return duct, or it may be returned to the base of the heater in any usual manner, and occupy all of that part of the space within the casing A between the heater B and the casing A except that part partitioned off as a separate compartment between the partitions G and H and the casing A and the heater B.

The fresh exterior air passes through the cold air duct F and enters the separate com partment within the casing This compartment may be formed separate from the casing A as in F ig. at, but preferably by the partitions G and H and easing A and heater B. Q

I am aware that the fresh aircompartment within the casing A, may extend past the heating surfaces, the air not in directcontact with the surfaces, or that it may extend in a manner not directly verticah or it may be divided into more than one compartment or duct; but I prefer to construct the compartment substantially as shown.

It will be observed in the drawing Figure 2 that the partitions G and I-I do not extend vertically above the top of the heater B, and that the fresh exterior air can at this point mingle with the recirculating air from the rooms, both currentsof air having at this point separately passed the heating surfaces of the furnace. It may be found desirable in certain cases to extend the separate fresh air compartment vertically to the top of the. outer casing A of the furnace and allow the fresh air to continue through the hot air duct J to the rooms of the house, entirely separated in its passage from the recirculatmg air.

This extension of the fresh air compartment I accomplish by continuing the partitions G and H to the horizontal top of the casing A and by adding a third partition from the top. of the heater B to the top of the casing A between the partitions G and H, see Figure 3. I prefer to mingle these two currents after passing the heated surfaces, at a point above the heater and within thecasing of the furnace.

I am aware that a furnace having a single hot air duct is in common use, but that form of construction does not in any way inter fere with the installation and use of the sep-' arate fresh air compartment of my design which in such cases is placed within the iiiner or primary casing K of the furnace, see Fig. 4.

The designs of furnaces are given as an illustration and not as a limitation of my invention, since the principle of my invention is adaptable to various forms of furnaces and to various methods of warm air circulation.

I claim,-

1. A furnace having heatingmeans, a casing surrounding the heating means and spaced therefrom, one or more ducts communicating with the rooms and with the upper portion of the space between the casing and the heating;- means, means for the return of air from the rooms to the lower portion of said space a compartment within said space between the casing. and the heating means extending from the lower portion of the heat ing means upward, past and adjacent to the heating surfaces of the heating means and. open at its upper extremity within the casing and a duct communicating with the lower portion of said compartment and with the exterior air.

2. A furnace having heating means, a casing surrounding the heating means and spaced therefrom, one or more ducts communicating with the rooms and with the upper portion of the space between the casing and the heating means, means for the return of air from the rooms to the lower portion of said space, partitions extending between the casing' an l the heating means from the lower portion of the heating means upward past the heating surfaces of the heating means and forming a compartment open at the upper extremity within the casing, and a duct communicating with the lower portion of said compartment and with the exterior air.

3. A furnace having heating means, a casing surrounding the heating means and spaced therefrom, one or more duct-s communicating with the rooms and with the upper portion of the space between the casing and the heating means, means for the return of air from the rooms to the lower portion of said space partitions extending between the casing and the heating means forming a compartment extending from' the lower port-ion of the heating means upward to the top of the casing a duct communicating with the lower portion of said compartment and with the exterior air, and av duct crimrnunicatinp with the upper portion. or sairl compartment and with the room's;

4:. A furnace having heating means, a are in'g surrounding the heating means and spaced therefrom, one oi" more duc'tfs communicating with the rooms and with the upper portion of the space between the casing and the heating means, means for the return of air from the rooms to the lower portion of said space, a compartment within said space between the casing and theh'e'ating means extending from the lower portion of the heating meansupward', past "and adjacent to the heating surfaces of the heating means to the upper extremity within the casing, a duct communicating withthe lower portion of said compartment and with the exterior air, a duct communicating with the upper portion of said compartment and with the rooms.

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